Re: BUG #13822: Slave terminated - WAL contains references to invalid page

On Thu, Dec 17, 2015 at 9:50 PM,  <marek.petr@tieto.com> wrote:
> Several days after one in-place and one out of place upgrade from 9.3 to 9.4
> version following event occured on both  environments:
>
> 2015-12-15 22:35:18 CET @ WARNING: page 4119662 of relation base/16422/18134
> is uninitialized
> 2015-12-15 22:35:18 CET @ CONTEXT: xlog redo visible: rel 1663/16422/18134;
> blk 4119662
> 2015-12-15 22:35:18 CET @ PANIC: WAL contains references to invalid pages
> 2015-12-15 22:35:18 CET @ CONTEXT: xlog redo visible: rel 1663/16422/18134;
> blk 4119662
> 2015-12-15 22:35:18 CET @ LOG: startup process (PID 22269) was terminated by
> signal 6: Aborted
> 2015-12-15 22:35:18 CET @ LOG: terminating any other active server process
>
> Once it was TOAST and another regular table.

This is the indication of some data corruption, page 4119662 referring
to at least a size of 31GB, but this so less information it is hard to
guess what could happen. Is 31GB more or less the size of this
relation? If you deploy a slave from a fresh base backup, do you still
see the error? That's unlikely so if it is the second time you are
seeing this problem, but it may be a problem of corruption within the
WAL segments themselves.
--
Michael